Table A.1:
X-ray sources detected in CMa R1 by ROSAT. 
CMaX      Err      Cnt/ks      S/N      log$L_{\rm x}$      RA          Dec            R       AV         J       H         K      Age      Mass
         ('')                                             J2000         J2000         (mag)     (mag)   (mag)   (mag)     (mag)    (Myr)  ($M_{\odot }$)

 1      30     16.7 $\pm$ 1.6      10.4      31.25      6 57 52.6      -11 27 23       9.7      1.0       8.9       8.7       8.6      <1      3.0-5.0
 2      30      5.0 $\pm$ 0.8       6.3      30.72      6 58 17.6      -11 37 10      15.7      1.0      14.5      13.9      13.8      05-10      1.0-1.5
 3a     30     17.9 $\pm$ 1.6      11.2      31.28      6 58 42.6      -11 42 00       9.0      0.5       8.4       8.2       8.1      <1      3.0-5.0      (a) HD 51896 (F5)
 4b     30     19.4 $\pm$ 1.4      13.9      31.31      6 59 02.0      -11 00 38      10.8      0.4      11.5      11.4      11.4      05-10      1.5-2.0   (b) SS 75
 5c     30      5.0 $\pm$ 0.9       5.6      30.72      6 59 10.7      -11 40 03       8.3      0.5       7.7       7.5       7.4      <1?      >5          (c) HD 52014 (F5)
 6      30      7.0 $\pm$ 0.9       7.8      30.87      6 59 10.7      -11 57 30      13.0      1.0      11.2      10.8      10.7      02-05      2.0-3.0
 7      30      5.1 $\pm$ 0.8       6.4      30.73      6 59 31.0      -11 58 18      11.8      0.9      11.0      10.6      10.6      02-05      2.0-3.0
 8      20      2.4 $\pm$ 0.6       4.0      30.40      6 59 51.1      -11 15 52      12.7      0.5      11.2      10.7      10.5      01-02      2.0-3.0
 9      12      1.4 $\pm$ 0.4       3.5      30.17     (7 00 00.5)    (-11 14 09)      -         -         -        -         -         -         -
10      30      5.1 $\pm$ 0.7       7.3      30.73      7 00 03.4      -11 47 45       -         -        9.6       9.6       9.6      < 1      3.0-5.0
11      10      2.8 $\pm$ 0.5       5.6      30.47      7 00 03.8      -11 15 26      14.8      0.4      13.7      13.2      13.0      20-50      1.0-1.5
12       5      3.7 $\pm$ 0.6       6.2      30.59      7 00 05.2      -11 31 46      14.8      0.8      13.4      12.8      12.7      05-10      1.0-1.5
13      12      1.2 $\pm$ 0.3       4.0      30.10      7 00 08.0      -11 37 00      14.9      0.5      14.1      13.4      13.2      05-10      1.0-1.5
14      12      2.2 $\pm$ 0.4       5.5      30.36      7 00 12.5      -11 34 33      16.6      0.8      13.8      13.1      12.9      02-05      1.0-1.5
15      10      1.9 $\pm$ 0.4       4.8      30.30     (7 00 14.5)     (-11 18 51)      -        -         -        -          -         -        -
16      10      2.0 $\pm$ 0.5       4.0      30.32      7 00 17.0      -11 08 03      13.7      0.4      12.6      12.4      12.3      >50      1.5-2.0
17       9      1.3 $\pm$ 0.3       4.3      30.14     (7 00 19.8)     (-11 23 20)      -        -         -        -          -         -         -
18       8      1.1 $\pm$ 0.3       3.7      30.06      7 00 26.5      -11 26 33      14.9      0.8      13.1      12.4      12.2      02-05      1.0-1.5
19      30      4.6 $\pm$ 0.8       5.8      30.69      7 00 27.1      -11 51 26      13.4      0.8      12.4      12.1      12.0      10-20      1.5-2.0
20d      5     62.7 $\pm$ 1.9      33.0      31.82      7 00 37.6      -11 14 45       7.8      0.7       6.6       6.0       5.9      <1?      >5          (d) HD 52385 (K0)
21      30     41.6 $\pm$ 1.9      21.9      31.64      7 00 40.4      -11 04 35      12.3      0.9      10.6       9.9       9.7      <1      1.0-1.5
22       6      2.0 $\pm$ 0.4       5.0      30.32     (7 00 41.3)     (-11 34 50)      -        -         -        -          -        -         -
23       5      3.4 $\pm$ 0.5       6.8      30.55      7 00 43.4      -11 17 14      14.3      0.5      12.9      12.3      12.2      02-05      1.5-2.0
24*      8      1.1 $\pm$ 0.4       2.8      30.06      7 00 45.4      -11 31 00      16.9      0.5      15.9      15.6      15.0      ??      ??          (IRx)
25       8      0.4 $\pm$ 0.2       2.0      29.62      7 00 45.5      -11 20 29      17.0      0.8      16.0      15.7      15.6      ??      ??
26      12      1.2 $\pm$ 0.3       4.0      30.10      7 00 54.6      -11 34 12      14.0      0.8      13.2      12.8      12.7      20-50      1.0-1.5
27*     10      2.2 $\pm$ 0.5       4.4      30.36      7 00 55.5      -11 21 45      15.7      0.7      14.6      14.3      14.1      01-02      0.1-0.5  (IRx)
28       8      0.9 $\pm$ 0.3       3.0      29.98      7 00 55.8      -11 26 25      15.8      0.8      13.6      12.8      12.6      ??      ??
29       5      2.5 $\pm$ 0.4       6.3      30.42      7 01 00.8      -11 19 29      15.4      1.0      12.8      12.1      11.9      <1      0.5-1.0
30      12      2.1 $\pm$ 0.5       4.2      30.34      7 01 04.1      -11 39 48      16.4      0.7      15.2      14.4      14.2      05-10      0.1-0.5
31       9      0.8 $\pm$ 0.3       2.7      29.93      7 01 06.9      -11 31 23      10.6      0.7       9.4       9.0       8.8      <1      3.0-5.0
32       8      2.1 $\pm$ 0.4       5.3      30.34      7 01 11.2      -11 27 50      11.4      0.9      10.8      10.6      10.5      02-05      2.0-3.0
33      15      0.9 $\pm$ 0.3       3.0      29.98      7 01 13.1      -11 21 01      16.4      1.0      14.9      14.4      14.3      ??      ??
34       8      1.3 $\pm$ 0.3       4.3      30.14      7 01 16.3      -11 25 58      15.2      1.0      13.7      13.0      12.9      05-10      1.0-1.5
35       8      0.7 $\pm$ 0.3       2.3      29.87      7 01 20.1      -11 17 44      15.6      0.7      13.3      12.9      12.8      20-50      1.0-1.5
36      15      1.1 $\pm$ 0.3       3.7      30.06      7 01 24.4      -11 09 06      16.2      0.5      14.8      14.2      14.1      20-50      0.5-1.0
37      15      2.1 $\pm$ 0.4       5.3      30.34     (7 01 25.0)     (-11 08 50)      -        -         -        -         -         -           -
38       5      3.5 $\pm$ 0.4       8.8      30.57      7 01 26.8      -11 28 21      13.5      0.8      12.3      12.0      11.9      10-20      1.5-2.0
39       8      0.8 $\pm$ 0.3       2.7      29.93      7 01 29.2      -11 21 30      15.4      0.8      14.1      13.5      13.5      10-20      1.0-1.5
40      10      2.0 $\pm$ 0.4       5.0      30.32      7 01 30.4      -11 22 29      16.9      1.2      15.4      14.8      14.8      ??      ??
41       8      1.6 $\pm$ 0.4       4.0      30.23      7 01 34.0      -11 25 33      15.3      0.8      13.8      13.2      13.1      10-20      1.0-1.5
42      10      1.8 $\pm$ 0.4       4.5      30.28     (7 01 34.3)     (-11 11 16)      -        -         -        -          -         -          -
43      15      0.6 $\pm$ 0.3       2.0      29.80      07 01 35.1      -11 36 38     14.3      1.3      12.1      11.8      11.7      10-20      1.5-2.0
44       8      1.2 $\pm$ 0.3       4.0      30.10      7 01 35.8      -11 17 36      13.6      0.8      12.8      12.5      12.4      10-20      1.0-1.5
45      10      1.2 $\pm$ 0.4       3.0      30.10      7 01 41.1      -11 32 57      12.9      1.0      12.2      11.9      11.9      10-20      1.5-2.0
46      15      1.4 $\pm$ 0.4       3.5      30.17     (7 01 43.0)     (-11 10 20)      -        -         -        -          -          -        -
47       8      2.1 $\pm$ 0.4       5.3      30.34      7 01 45.9      -11 30 33      15.4      0.7      13.4      12.7      12.5      01-02      0.5-1.0
48e     15      2.7 $\pm$ 0.4       6.8      30.45      7 01 49.3      -11 18 07       7.5      1.7       6.3       6.2       6.0      ??      ??           (e) GU CMa, HD 52721 (B2V), C 63 , SEI 158
49       9      1.5 $\pm$ 0.4       3.8      30.20      7 01 49.5      -11 16 41      12.2      1.7      10.8      10.3      10.2      02-05      2.0-3.0
50      12      1.1 $\pm$ 0.3       3.7      30.06      7 01 52.4      -11 20 18      13.4      1.3      12.1      11.7      11.5      05-10      1.5-2.0
51       8      1.3 $\pm$ 0.4       3.3      30.14      7 01 56.3      -11 24 07      16.5      1.2      14.3      13.6      13.4      10-20      1.0-1.5
52       8      2.3 $\pm$ 0.4       5.8      30.38      7 01 58.7      -11 15 45      13.5      1.7      12.3      11.6      11.5      01-02      2.0-3.0
53      14      1.5 $\pm$ 0.4       3.8      30.20      7 02 04.4      -11 19 44      14.1      1.2      13.4      13.0      12.9      >50      05-1.0
54      15      0.5 $\pm$ 0.3       1.7      29.72     (7 02 05.5)     (-11 26 50)      -        -         -        -          -          -      -
55      30      0.6 $\pm$ 0.3       2.0      29.80     (7 02 07.4)     (-11 17 11)      -        -         -        -          -          -      -
56      30      5.3 $\pm$ 0.8       6.6      30.75      7 02 38.9      -11 30 39      12.8      0.9       9.9       8.9       8.6      ??      ??
57f     30      2.3 $\pm$ 1.0       2.3      30.40      7 02 42.6      -11 27 12       8.0      1.6       7.8       7.8       7.7      <1?      >5         (f) FZ  CMa (B2.5), C 67, SEI 159
58      30      2.0 $\pm$ 1.0       2.0      30.32      7 02 47.3      -11 28 08      16.6      1.6      14.9      14.3      14.1      >50      1.0-1.5
59      30      1.9 $\pm$ 1.0       2.0      30.31      7 02 51.3      -11 24 03      17.5      4.0      14.6      13.7      13.4      05-10      1.0-1.5
60      30      1.5 $\pm$ 0.9       1.6      30.20      7 03 30.4      -11 48 07      13.7      2.4      13.5      13.0      12.8      20-50      1.0-1.5
61x     30      1.7 $\pm$ 0.9       1.9      30.27      7 03 33.5      -11 34 27      15.2      2.6      13.5      12.8      12.5      05-10      1.0-1.5
62x     30      1.5 $\pm$ 0.9       1.7      30.20      7 03 42.1      -11 35 14      15.5      2.5      13.4      12.6      12.4      02-05      1.5-2.0
63*,g,x 30      2.5 $\pm$ 1.0       2.5      30.43      7 03 43.2      -11 33 06       9.1      3.4       6.5       5.2       3.8      ??      ??          (g) Z CMa (Bpe), C 76, SEI 161 (IRx), (X)
64x     30      2.9 $\pm$ 1.1       2.7      30.49      7 03 47.5      -11 31 49      13.8      1.3      13.5      12.8      12.6      01-02      0.5-1.0    (X)
65      30      1.2 $\pm$ 0.8       1.5      30.11      7 03 48.2      -11 41 46      14.0      0.3      13.6      12.8      12.6      ??      ??
66j,x   30      6.2 $\pm$ 1.4       4.3      30.82      7 03 51.5      -11 34 56      -           -      11.0      10.8      10.7      01-02      3.0-5.0   (j) member of vdB-RN92, (X)
67x     30      2.1 $\pm$ 1.0       2.2      30.35      7 03 52.5      -11 26 17      16.0      1.4      13.7      12.9      12.6      ??      ??            (X)
68j     30      2.0 $\pm$ 1.0       2.1      30.34      7 03 54.0      -11 32 37      14.1      2.3      14.6      13.7      13.3      2-5      0.5-1.0     (j) member of vdB-RN92, 
69h     30      7.9 $\pm$ 1.6       4.9      30.93      7 03 54.4      -11 28 29       9.4      1.5       9.4       9.4       9.4      <1?      >5          (h) BD -111762 (B2), C 77, SEI 92
70      30      2.2 $\pm$ 1.0       2.2      30.37      7 03 54.8      -11 42 37      15.1      0.3      12.0      11.5      11.3      01-02      1.5-2.0
71x     30      4.9 $\pm$ 1.3       3.7      30.72      7 03 55.7      -11 29 32      14.9      2.5      12.9      12.2      12.0      02-05      1.5-2.0    (X)
72i,j   30      1.6 $\pm$ 0.9       1.9      30.25      7 03 56.8      -11 34 42      11.0      7.0      10.5      10.2      10.1      ??      ??            (i) C 14, SEI 94, (j) member of vdB-RN92,
73j,x   30      2.9 $\pm$ 1.1       2.7      30.50      7 04 00.4      -11 34 00      12.7      7.0      12.1      10.9      10.2      <1      2.0-3.0       (j) member of vdB-RN92, (X)
74*,k   30      9.2 $\pm$ 1.8       5.3      31.00      7 04 01.4      -11 23 35      12.6      2.5      11.5      10.8      10.3      02-05      2.0-3.0     (IRx), (k) member of BRC 27. 
75k,l,x 30      6.4 $\pm$ 1.5       4.3      30.84      7 04 02.3      -11 25 39      10.8      1.3      10.4      10.3      10.3      1-2      3.0-5.0      (k) member of BRC 27, (l) SEI 99, (X)
76m     30      3.8 $\pm$ 1.3       3.0      30.61      7 04 06.6      -11 18 35      10.9      6.0      13.1      12.2      11.6      02-05      2.0-3.0    (m) member of NGC 2327
77m     30      3.0 $\pm$ 1.1       2.7      30.51      7 04 09.2      -11 30 08      14.2      0.8      13.7      13.0      12.9      01-02      1.0-1.5    (m) member of NGC 2327
78      30      2.2 $\pm$ 1.2       1.9      30.38      7 04 11.3      -11 16 48      13.4      3.5      12.0      11.4      11.1      05-10      2.0-3.0
79      30      4.1 $\pm$ 1.3       3.2      30.64      7 04 12.1      -11 21 10      13.8      2.9      14.4      13.4      13.1      ??      ??
80      30      2.1 $\pm$ 1.0       2.1      30.36      7 04 12.3      -11 39 23      12.0      1.2      11.3      11.0      11.0      05-10      2.0-3.0
81m,n   30      3.2 $\pm$ 1.2       2.7      30.54      7 04 13.2      -11 19 01       7.8      3.5      10.9      10.6      10.5      01-02      3.0-5.0    (m) member of NGC 2327, (n) SEI 111
82o,x   30      3.8 $\pm$ 1.2       3.0      30.61      7 04 15.9      -11 24 06       9.4      1.4       9.0       8.9       8.9      <1?      >5           (o) HD 53339 (B3), C84, SEI114; (X)
83p     30      3.5 $\pm$ 0.8       4.3      30.58      7 04 17.4      -11 43 10      10.9      0.6      10.2      10.1      10.0      02-05      3.0-5.0    (p) HD 53396 (B9), SEI 112
84x     30      3.5 $\pm$ 0.8       4.3      30.58      7 04 18.3      -11 42 36      13.8      0.0      12.0      11.5      11.3      02-05      1.5-2.0     (X)
85      30      4.2 $\pm$ 1.3       3.3      30.66      7 04 18.8      -11 24 47      14.7      0.8      14.6      13.9      13.7      05-10      0.5-1.0
86x     30      2.9 $\pm$ 1.1       2.6      30.50      7 04 19.1      -11 33 48      13.4      0.4      13.1      12.4      12.2      02-05      0.5-1.0     (X)
87      30      3.0 $\pm$ 1.2       2.6      30.51      7 04 20.0      -11 22 22      13.2      0.9      14.4      13.3      12.7      ??      ??
88      30      1.8 $\pm$ 0.9       1.9      30.29      7 04 20.6      -11 36 44      16.7      0.7      14.6      13.7      13.5      ??      ??
89x     30      3.5 $\pm$ 1.2       2.9      30.57      7 04 26.3      -11 31 21      13.8      0.8      12.5      11.6      11.2      ??      ??             (X)
90      30      4.0 $\pm$ 1.3       3.1      30.63      7 04 25.3      -11 34 28      13.2      1.1      11.7      11.1      10.9      <1      1.5-2.0
91x     30      5.2 $\pm$ 1.7       3.1      30.75      7 04 29.8      -11 47 21      12.1      0.0      11.2      10.5      10.3      ??      ??             (X)
92x     30      2.3 $\pm$ 1.1       2.2      30.39      7 04 31.0      -11 32 42      14.0      0.8      13.9      13.1      12.9      01-02      0.1-0.5     (X)
93      30      2.8 $\pm$ 1.1       2.4      30.47      7 04 37.0      -11 30 59      14.0      0.0      14.0      13.8      13.7      ??      ??
94      30      1.6 $\pm$ 1.0       1.5      30.23      7 04 48.4      -11 15 07      15.7      0.4      14.8      14.4      14.1      >50      1.0-1.5
95      30      5.4 $\pm$ 1.8       3.0      30.76      7 04 52.5      -11 38 21      14.7      0.2      13.2      12.4      12.1      ??      ??
96x     30      3.4 $\pm$ 1.5       2.3      30.56      7 04 56.3      -11 29 33      12.5      1.2      11.5      10.9      10.2      01-02      2.0-3.0     (X)
97      30      0.9 $\pm$ 0.6       1.7      30.00      7 05 15.5      -11 31 06      14.8      0.0      13.2      12.8      12.7      20-50      1.0-1.5
98      30      0.9 $\pm$ 0.6       1.7      30.00      7 05 15.7      -11 32 05      14.4      0.0      12.8      12.1      12.0      01-02      1.0-1.5

Columns description: (1) Source name: CMaX 1 to 56 (Field 1), CMaX 62
to 98 (Field 2), CMaX 57 to 61 (both fields); (2-5) X-ray data; (6, 7)
Coordinates of the optical counterpart, when available; (8, 9) R
magnitude and visual extinction (AV), obtained from available
catalogues; (10-12) Near-IR magnitudes from the 2MASS catalogue; (13,
14) The estimation of age and mass is based on near-IR.

Notes: Stars previously identified (Clari 1974, indicated by ``C and Shevchenko et al. 1999, indicated by ``SEI'')
Objects detected by XMM-Newton and/or Chandra are indicated by ``x''. Relevant sources: (*) H-K excess.

Notes: Stars previously identified (Clari 1974, indicated by ``C''
and Shevchenko et al. 1999, indicated by ``SEI''): 
